Dry shaver



Jan. 16, 1940. v R, KNAPP 2,187,271

V DRY sHAyER' Filed oct. :5, 193s APatented Jan. 16, 1940 UNITED STATES PATENT OFFICE y DRY 'SHAVER Raymond Knapp, Long Island City, N. Y., as-i signor to Knapp-Monarch Company, St. Louis, Mo'., a corporation of Missouri Application October, 1938, Serial No. 233,056

4 Claims.

An object of my invention is to provide a shaving device which removes hair by an abrasive l action, thereby obviating the necessity of using a lather or cream on the face during the shaving operation.

Another object is to provide a small, compact dry shaving device having an abrading member adaptable to remove hair by abrasive action and to so coact with the hair that it is bent to a substantially upright position for coaction of the dry shaver therewith, the abrasive member of the shaver being especially designed with a .plurality of substantially radially extending grooves for this purpose.

A further object is to provide an abrasive member which is mounteddn a cup on a motor shaft or the like and has a convex end for substantially point contact with the hairs projecting from the skin of the user, the convex` surface being on the end of the shaft whereby hair may be engaged with variable surface speed of the abrasive by shifting the abrasive s o .that the hair is engaged relatively close to the center or close to the peripheral edge of the abrasive u member. l

Another object is to provide a' hair abrading member with anl abrasive surface on its end for engagement-with the hair projecting from the users skin so that the abrading member can be jg reciprocated relative to the users skin and the hair is thereby engaged by the abrasive member .on opposite sides of the axis of rotation, so that it is alternately bent in first one direction and then the other, thus facilitating the abrai u action of the shaver on the hair.

Still another object is to provide the grooves of the abrading -member extending across the peripheral edge thereof, so that when desired the edge of the abradlng member can be used when found desirable for certain parts of the face. I With these and other objects in view, my in'- vention will be apparent from the following description, accompanying drawing and appended claims. For a better detailed understanding of the invention, reference is made to the follow- A ing description and to the accompanying drawlinaninwhich: Y y

Figure l is a perspective view of a dry shaver embodying my invention;

ld Figure 2 is an enlarged side elevation of the abrasive member thereof, a portion being broken away and another portion thereof being shown in section;

Figure 3 is a top pian view of the abrasive member showing a dotted position to illustrate the action of the abrasive member on the hair being shaved thereby, and 1 Figure 4 is a perspective view of the abrasive member in use for shaving hair from the skinof the user.

On the accompanying drawing I have used the reference numeral I0 to indicate a motor casing. An electric motor of any suitable type may be contained therein, as the type of motor used in dry shavers and the like. By way of example, w such a motor is shown in my prior patent, No. 2,077,329, of `April 13, 1937, and accordingly the motor is not illustrated in detail in the present case. A supply cord I2 is illustrated, terminating in a plug Il, for supplying current to the motor.v The shaft of the motor projects from a bearing I5 of the casing Il) as illustrated at I6. A cup I1 of metal or the like is mounted on the outer end of the motor shaft I6 and is adapted to support the abrasive member A which is cemented there- 20 The member A may be made of any abrasive material ,suitable for the purpose of shaving by abrasive action. I have found ordinary emery wheels and carborundum` wheels suitable for this 26" purpose. y

The abrasive member A is s'omewhat in the form of a button having a convex outer surface I B and a rounded peripheral edge I9. -A plurality of grooves 20 (preferably three) extend 3o substantially radially from the center of the convex end I8 and across the peripheral edge, as indicated at 2 I. The peripheral edge of the abrasive member as shown clearly in Figure 2 overhangs the periphery of the cup I1 so as to have 35 a portion of relatively small radius when it is found desirable to us'e the peripheral edge for hair shaving Purposes.

The rounded or convex end I8 serves a number of purposes, due to its shape and relation to the 40 axis of rotation of the abradlng member; The convex surface provides for substantially vpoint contact with the hairs of the skin as distinguished from a relatively large `area contact. By having the abrasive surface on the end 'of the 45 motor shaft, the memberA A can be reciprocated relative to the skin of the user, for instance between the full and dotted line positions as shown in Figure 3, to secure a very desirable result. This result is illustrated and consists of bending a hair (indicated at 22) in alternatively opposite directions as Vthe abrasive member is shifted or reciprocated in its position. The axes of rotation are indicated at 23 and 23a, and it will be noted that these two axes are on opposite sldes Il sive action.

In Figure 4 I have shown hairs 22a projecting from the skin 25 of the user. 'I'he abrasive member A rotating in the direction of the arrow 26 tends to bend the hairs 22a as indicated at 22h. Whenever one of the grooves 20 registers with a hair, it will spring back to the position illustrated for the hair 22e, and thereby the grooves. also facilitate the shaving of hair by abrasive action.

Another feature of my arrangement is that the hair can be engaged by diil'erent annular portions of the abrasive member A and thereby at different speeds of surface travel. It is therefore evident 'that a number of advantages are obtained by with the hairs projecting from the skin of the user, as distinguished from a cylindrical or similar type of abrasive member.

In accordance with the provisions of the patent statutes, I have described the principle of operation of my invention together with an illustration thereof which I consider to represent the best embodiment. Some changes may be made, however, in the construction and arrangement of the parts thereof without departing from the real spirit and purpose of my invention. lI intend to cover by my claims modified forms of structure and use of mechanical equivalents which come within the scope thereof.

What I claim as new and desire to secure by letters Patent is:

convex end being engageable with hair projecting from the-users skin whereby reciprocation of saidabrasive member end relative thereto causes said groovestoengagethehairsothattliehair is alternately on opposite sides of the axis of rotation and it is bent by the abrading member in alternately opposite directions. the peripheral edge of said hair abrading member being rounded 5 and overhanging the peripheral edge of said cup. said grooves extending across said rounded peripheral edge of said abrading member for bending hair to a substantially upright positionl when engaged by said peripheral edge. 10

2. In a dry shaver of the character described, a casing, a motor shaft extending therefrom, a cup mounted on the outer end of said motor shaft and a hair abrading member supported in said cup and having a convex end provided with a plurality of grooves extending substantially radially from the center thereof, said convex end being engageable with hair projecting from the users skin whereby reciprocation of said abrasive member end relative thereto causes said grooves to engage the hair so that the hair is alternately on opposite sides of the axis of rotation and it is bent by said abrading member alternately in opposite directions.

3. In a dry shaver of the character described, 25

a motor shaft, a cup thereon and a hair abrading member supported in said cup and provided with a plurality of grooves, said abrading member being engageable with hair projecting from the users skin whereby reciprocation of said abrasive member relative thereto causes said grooves to engage the hair so that the hair is alternately bent in opposite directions, the peripheral edge` of said hair abrading member being rounded and overhanging the peripheral edge of said cup and said grooves having continuations extending across said rounded, peripheral, overhanging edge of said abrading member.

4. In av shaving device, a rotating shaft, an abrasive member carried thereby and having a convex abrasive surface on the end thereof for engagement with hair projecting from the users skin, said end having a plurality of substantially radially extending grooves formed therein.

i RAYMOND KNAPP. 

